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Date: Sat, 25 Oct 2008 06:38:08 -0400 From: Chris Snook <csnook@...hat.com> To: Matt Mackall <mpm@...enic.com> CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, akpm <akpm@...uxfoundation.org> Subject: Re: Bloatwatch 2.6.28-rc1: last_sysfs_file Matt Mackall wrote: > On Fri, 2008-10-24 at 15:52 -0500, Matt Mackall wrote: >> 2.6.28-rc1 adds 4k for last_sysfs_file debug tracking. That's one hell >> of a long sysfs path. >> >> http://www.selenic.com/bloatwatch/?cmd=compare;v1=2.6.27;v2=2.6.28-rc1;part=/built-in/fs/sysfs > > ..especially given that printk is limited to 1k at a time. > > > sysfs: shrink last_sysfs_file to a reasonable size > > sysfs was reserving 4k to store filenames for debug despite printk being > limited to 1k. Shrink this to something more reasonable. > > Signed-off-by: Matt Mackall <mpm@...enic.com> > > diff -r ac8c82ff3be7 fs/sysfs/file.c > --- a/fs/sysfs/file.c Fri Oct 24 13:13:04 2008 -0500 > +++ b/fs/sysfs/file.c Fri Oct 24 16:11:53 2008 -0500 > @@ -25,7 +25,7 @@ > #include "sysfs.h" > > /* used in crash dumps to help with debugging */ > -static char last_sysfs_file[PATH_MAX]; > +static char last_sysfs_file[200]; /* allow for disgustingly long paths */ > void sysfs_printk_last_file(void) > { > printk(KERN_EMERG "last sysfs file: %s\n", last_sysfs_file); > > Please don't use magic numbers. Use a symbolic constant, and modify printk.c to use the same. If we're going to impose limits lower than the maximum, let's at least be consistent about it. -- Chris -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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